Had it been possible, I would have gone to attend Monica in the hospital, but I  fully occupied last month.

A．had beenB．wasC．a(chǎn)mD．have been 過(guò)去相反，

B

解析試題分析：考查時(shí)態(tài)。But后面的句子使用陳述語(yǔ)氣，要根據(jù)前面的虛擬語(yǔ)氣的形式確定后面的時(shí)態(tài)。如果前面表示與過(guò)去相反，那么后面就使用過(guò)去時(shí)。如果前面前面表示與現(xiàn)在相反，后面就使用現(xiàn)在時(shí)。本題前面使用了would have gone,這是一個(gè)表示與過(guò)去相反的虛擬語(yǔ)氣，故后面使用過(guò)去時(shí)。故B正確。
考點(diǎn)：考查時(shí)態(tài)
點(diǎn)評(píng)：But后面的句子使用陳述語(yǔ)氣，要根據(jù)前面的虛擬語(yǔ)氣的形式確定后面的時(shí)態(tài)。如果前面表示與過(guò)去相反，那么后面就使用過(guò)去時(shí)。如果前面前面表示與現(xiàn)在相反，后面就使用現(xiàn)在時(shí)。

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       D．is dangerous to animals and human beings

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       A．hasn’t attracted much attention

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       C．was first found by Austrian researchers

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       A．the virus could also cause other damages

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